volcanos which come out, the rocks that are come out are basalt, big blocks of rock all over the place. well, these volcanos discovered day before yesterday -- or not discovered, got really good pictures day before yesterday -- were made from something else, and apparently it's a radioactive decay that left thorium, one of the happy radioactive elements that came out on the surface. so this thing was probably a bubble of lava, a bubble of mag ma that came up to the moon's surface. and what this means is there's more to it than you thought at first. because one of the two questions that trouble all of us, jon: are we alone and be where did we come from? so when you find out more about the history of the moon, you learn more about where we all came from, and this is, every rock tells a story, as we say. jon: does it go anywhere close